黑龙江省柳绵蚧生物学特性的初步研究

A PRELIMINARY STUDY ON THE BIONOMICS OF PULVINARIA SALICICOLA BORCHS IN HEILONGJIANG PROVINCE

柳绵蚧（ＰｕｌｖｉｎａｒｉａｓａｌｉｃｉｃｏｌａＢｏｒｃｈｓ．）在黑龙江省林甸县主要为害行道绿化柳树，其为害率高达９０％，使树势生长衰弱，导致枝条枯死。一年发生一代，以２龄若虫在柳树的枝干部越冬，成虫的发生期为５月上旬至６月中旬，初孵若虫出现在７月中旬。柳绵蚧有两种寄生小蜂．其中食蚧蚜小蜂对柳绵蚧的控制力最强，一年发生两代，越冬代寄生率为１６．９％，第一代寄生率为５０．７９％。

Pulvinaria salicicola Borchs mainly happens on road-side afforested willows in Lindian County of Heilongjiang Province and the injury rate of the pest is as high as 90%.which can weaken the growth of the trees and cause death of the branches. The pest happens one generation a year,overwinters on branches by 2nd instar nymph. Adult emerges from early May to middle of June, 1st instar nymph emerges in middle of July.Two species of parasite chalcids were found on P.salicicola,between which Coccophagus sp.has the best control capacity on the pest,occuring two generations a year. The parasite rate of overwintering generation is 16. 90%, while that of 1st generation is 50. 7%.